planet ' s gravity . the variations were detected by making sensitive measurements of the do ##pp ##ler shift of ups ##ilo ##n and ##rom ##eda ##e ' s spectrum . the planet ' s existence was announced in january 1997 , together with 55 can ##cr ##i b and the planet orbiting tau boot ##is . like 51 peg ##asi b , the first extras ##olar planet discovered around a normal star , ups ##ilo ##n and ##rom ##eda ##e b orbits very close to its star , closer than mercury does to our sun . the planet takes 4 @ . @ 61 ##7 days to complete an orbit , with a semi ##ma ##jo ##r axis of 0 @ . @ 05 ##9 ##5 au
planet's gravity. the variations were detected by making sensitive measurements of the doppler shift of upsilon andromedae's spectrum. the planet's existence was announced in january 1997, together with 55 cancri b and the planet orbiting tau bootis. like 51 pegasi b, the first extrasolar planet discovered around a normal star, upsilon andromedae b orbits very close to its star, closer than mercury does to our sun. the planet takes 4 @. @ 617 days to complete an orbit, with a semimajor axis of 0 @. @ 0595 au